The Rotation Period of the Sun: As Determined From the Motions of the Calcium Flocculi (Classic Reprint) - Softcover

Inhaltsangabe

Excerpt from The Rotation Period of the Sun: As Determined From the Motions of the Calcium Flocculi

In measuring photographs distorted in this way the necessary correction for a point at a given distance from the Sun's limb might be taken from a table, readily constructed for a given position of the Sun's image with respect to the axis of the collimator. To define this position, means were provided for making the solar image concentric with the axis of the collimator. Care was always taken to orient the image so that the distorted axis should be parallel to the solar equator in the photograph. For this purpose the whole instrument could be rotated about the axis of the collimator, the direction of the slit being read 03 on a position circle. The parallel lines on the photo graph (due to dust on the slit, which can not be altogether avoided in any form of spectroheliograph when the slit is narrow) were made to serve a useful purpose in the orientation of the image.

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